Voltage-gated potassium channel subunit beta-2 - P62483 (KCAB2_RAT)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for P62483: 13
 
Function
Cytoplasmic potassium channel subunit that modulates the characteristics of the channel-forming alpha-subunits (PubMed:9763623, PubMed:21357749). Contributes to the regulation of nerve signaling, and prevents neuronal hyperexcitability (By similarity). Promotes expression of the pore-forming alpha subunits at the cell membrane, and thereby increases channel activity (PubMed:10896669, PubMed:16770729, PubMed:18003609, PubMed:21357749). Promotes potassium channel closure via a mechanism that does not involve physical obstruction of the channel pore (PubMed:21357749). Modulates the functional properties of KCNA4 (PubMed:9763623). Modulates the functional properties of KCNA5 (By similarity). Enhances KCNB2 channel activity (By similarity). Binds NADPH and has NADPH-dependent aldoketoreductase activity (PubMed:18672894, PubMed:21209188). Has broad substrate specificity and can catalyze the reduction of methylglyoxal, 9,10-phenanthrenequinone, prostaglandin J2, 4-nitrobenzaldehyde, 4-nitroacetophenone and 4-oxo-trans-2-nonenal (in vitro) (PubMed:18672894). UniProt
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Subunit Structure
Homotetramer (PubMed:10884227, PubMed:16002581, PubMed:18004376, PubMed:18806782, PubMed:20534430, PubMed:20360102, PubMed:23705070). Interaction with tetrameric potassium channel alpha subunits gives rise to a heterooctamer (PubMed:10884227, PubMed:16002581, PubMed:18004376, PubMed:18806782, PubMed:20534430, PubMed:20360102, PubMed:23705070). Identified in potassium channel complexes containing KCNA1, KCNA2, KCNA4, KCNA5, KCNA6, KCNAB1 and KCNAB2 (PubMed:9334400). Interacts with KCNA1 (PubMed:23318870, PubMed:10884227). Interacts with KCNA2 (PubMed:18003609, PubMed:21357749, PubMed:23318870, PubMed:16002581, PubMed:18004376, PubMed:18806782, PubMed:20534430, PubMed:20360102, PubMed:23705070). Interacts with KCNA4 and KCND3 (PubMed:12860406). Interacts with KCNA5 (By similarity). Interacts with KCNB2 (By similarity). Interacts (in unphosphorylated form) with MAPRE1 (PubMed:21357749). Forms a ternary complex with SQSTM1 and PRKCZ (PubMed:10477520). UniProt
Domain
In contrast to KCNAB1, the shorter N-terminal domain of KCNAB2 cannot mediate closure of delayed rectifier potassium channels by physically obstructing the pore. UniProt
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Data in green originates from UniProtKB  
Variation data (sourced from UniProt) shows non-genetic variation from the ExPASy   and dbSNP   websites.
Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
Data in purple originates from Phosphosite  .
Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
  • Red: hydrophobic
  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
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Data in red indicates combined ranges of Homology Models from SBKB   and the Protein Model Portal  
The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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